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'Februari 2014 - Version 1.17 by Gerrit van Kuipers   aspJSON
Class POPASP_VERIFY
	Sub output(pSN)
		if pSN = "" Then
			pSN = "verify"
		end if
		'Response.buffer=true 
		' 禁止缓存 
		Response.Expires = -9999 
		Response.AddHeader "Pragma","no-cache"
		Response.AddHeader "cache-ctrol","no-cache"
		Response.ContentType = "Image/BMP"
		 
		Randomize 
		 
		Dim i, ii, iii 
		 
		Const cOdds = 2 ' 杂点出现的机率 
		Const cAmount = 10 ' 文字数量 
		Const cCode = "0123456789"
		 
		' 颜色的数据(字符，背景) 
		Dim vColorData(1) 
		vColorData(0) = ChrB(0) & ChrB(0) & ChrB(211) ' 蓝0，绿0，红0（黑色） 
		vColorData(1) = ChrB(255) & ChrB(255) & ChrB(255) ' 蓝250，绿236，红211（浅蓝色） 
		 
		' 随机产生字符 
		Dim vCode(4), vCodes 
		For i = 0 To 3 
		vCode(i) = Int(Rnd * cAmount) 
		vCodes = vCodes & Mid(cCode, vCode(i) + 1, 1) 
		Next
		Session(pSN) = vCodes '记录入Session 
		' 字符的数据 
		Dim vNumberData(9) 
		vNumberData(0) ="1110000111110111101111011110111101001011110100101111010010111101001011110111101111011110111110000111" 
		vNumberData(1) ="1111011111110001111111110111111111011111111101111111110111111111011111111101111111110111111100000111" 
		vNumberData(2) ="1110000111110111101111011110111111111011111111011111111011111111011111111011111111011110111100000011" 
		vNumberData(3) ="1110000111110111101111011110111111110111111100111111111101111111111011110111101111011110111110000111" 
		vNumberData(4) ="1111101111111110111111110011111110101111110110111111011011111100000011111110111111111011111111000011" 
		vNumberData(5) ="1100000011110111111111011111111101000111110011101111111110111111111011110111101111011110111110000111" 
		vNumberData(6) ="1111000111111011101111011111111101111111110100011111001110111101111011110111101111011110111110000111" 
		vNumberData(7) ="1100000011110111011111011101111111101111111110111111110111111111011111111101111111110111111111011111" 
		vNumberData(8) ="1110000111110111101111011110111101111011111000011111101101111101111011110111101111011110111110000111" 
		vNumberData(9) ="1110001111110111011111011110111101111011110111001111100010111111111011111111101111011101111110001111" 
		' 输出图像文件头 
		Response.BinaryWrite ChrB(66) & ChrB(77) & ChrB(230) & ChrB(4) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) &_ 
		ChrB(0) & ChrB(0) & ChrB(54) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(40) & ChrB(0) &_ 
		ChrB(0) & ChrB(0) & ChrB(40) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(10) & ChrB(0) &_ 
		ChrB(0) & ChrB(0) & ChrB(1) & ChrB(0) 
		 
		' 输出图像信息头 
		Response.BinaryWrite ChrB(24) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(176) & ChrB(4) &_ 
		ChrB(0) & ChrB(0) & ChrB(18) & ChrB(11) & ChrB(0) & ChrB(0) & ChrB(18) & ChrB(11) &_ 
		ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) &_ 
		ChrB(0) & ChrB(0) 
		 
		For i = 9 To 0 Step -1 ' 历经所有行 
			For ii = 0 To 3 ' 历经所有字 
				For iii = 1 To 10 ' 历经所有像素 
				' 逐行、逐字、逐像素地输出图像数据 
				If Rnd * 99 + 1 < cOdds Then ' 随机生成杂点 
					Response.BinaryWrite vColorData(0) 
				Else
					Response.BinaryWrite vColorData(Mid(vNumberData(vCode(ii)), i * 10 + iii, 1)) 
				End If
				Next
			Next
		Next
	End Sub
End Class
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